advent
/ˈædvent/·애드벤트·noun
the arrival of something new and important
LatinCEFR C1
Root
ad- (to, toward) + Latin 'venire' (to come)
Latin adventus (a coming, arrival) → Old French advent → English advent
In a word
ad- (toward) + vent (come) = 'a coming toward'. The same root sits in the Christian Advent season — the weight of something significant approaching. English packs that weight into two syllables. "The advent of AI" reads almost religious if you trace the root.
Examples
The advent of the internet changed everything.
With the advent of spring, the trees bloom.
The advent of digital cameras ended film for most users.
Related
preventinventconveneinterventionevent